G19E Has eight 6 volt batteries??

I came across a 2000 G19E cart today, and it had eight 6 volt batteries in it!!

Is this normal?? I haven't seen a yamaha before that had more than 6 batteries in it. I want to know if these came that way, or if someone did this ?

I will probably install six 8 volt batteries for the guy, it will be alot cheaper.